PAM8901JER_01

Overview

The PAM8901JER is a stereo headphone amplifier manufactured by Diodes Incorporated, designed for portable equipment. It operates from a single supply voltage ranging from 2.5V to 5.5V and delivers up to 35mW per channel into a 16Ω load at 1kHz with 1% THD. The device features a TrueCapFree architecture that eliminates the need for DC-blocking capacitors by biasing outputs at 0V. It includes selectable gain settings of -6dB, 0dB, 3dB, and 6dB, an 80dB PSRR at 1kHz, and shutdown current below 1µA. The component is housed in a TQFN3x3-16L package.

Feature Summary

• TrueCapFree Architecture: Eliminates the need for large DC-blocking output capacitors by generating ground-referenced outputs from a single supply, saving board space and component height.
• Integrated Charge Pump: Utilizes a patent-pending three-phase power line shift charge pump to generate positive and negative supplies for the amplifiers without external boost converters.
• Selectable Gain Control: Offers four programmable gain settings (-6dB, 0dB, 3dB, and 6dB) via digital control pins G0 and G1 to accommodate various input signal levels.
• Low Power Consumption: Features automatic standby functionality with shutdown current reduced to less than 1µA, extending battery life in portable applications.

Applications

• Smart Phones and Cellular Phones
• Notebook Computers
• Portable DVD Players
• Personal Digital Assistants (PDAs)
• Electronic Dictionaries

Procurement Notes

Verify component authenticity through authorized Diodes Incorporated distributors or certified partners. Confirm the datasheet revision matches the specific manufacturing lot. Ensure compliance with RoHS3 and REACH regulations as stated in the manufacturer's environmental declaration. Validate that the TQFN3x3-16L package dimensions align with your PCB footprint requirements before finalizing procurement orders.

Selection Notes

Select this component for designs requiring high-fidelity audio output in space-constrained portable devices. The TrueCapFree feature simplifies the bill of materials by removing bulky output capacitors. Ensure the system power supply remains within the 2.5V to 5.5V operating range. Consider the thermal resistance characteristics when designing the PCB layout to maintain junction temperatures within safe limits during continuous operation.

Part Context

The PAM8901 belongs to Diodes Incorporated's portfolio of audio amplifiers tailored for mobile electronics. It addresses the industry demand for compact audio solutions by integrating charge pump technology directly into the amplifier IC. This integration allows for efficient operation from low-voltage batteries while maintaining high sound quality standards required for modern consumer electronics.

Replacement Considerations

The datasheet explicitly states that the PAM8901 is not recommended for new design and recommends using the PAM8908 as a replacement. Verify if the PAM8908 meets all functional and pinout requirements for your existing application before transitioning.

FAQ

How does the TrueCapFree architecture function?

The TrueCapFree architecture uses internal charge pumps to generate positive and negative supply rails for the headphone amplifiers from a single positive supply voltage. This allows the output voltages to be centered around 0V (system ground), eliminating the need for external DC-blocking capacitors.

What are the available gain settings for the PAM8901?

The PAM8901 provides four selectable gain settings controlled by the G0 and G1 pins: -6dB, 0dB, 3dB, and 6dB. These settings allow the user to match the amplifier output to different input signal levels.